Statistics – hypothesis testing for two groups

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Assignment attached.

End of chapter questions for textbook Statistics Alive, 2nd ed.  IBM SPSS 21 needed as well.


Modules 19, 20, 21, 22, and 23



  1. In two separate studies, the actual difference between the means of a treated group and an untreated group is 3 points. However, in one study, the σM1-M2 is very large and so the 3 points is not found to be significant. In the other study, the σM1-M2 is very small and so the 3 points is found to be significant. What might have caused this big difference in the σM1-M2 for the two studies?
  2. In a study of the effect of a new drug on the alleviation of asthma symptoms, the σM for symptom relief in the patient group that received the new drug is 1.45, and the σM for symptom relief in the group that did not receive the new drug is 1.22. Calculate the σM1-M2.
  3. Manually enter the 18 scores from the depression example in Module 20 into the SPSS Data View spreadsheet. Data entry for a t test with equal sample sizes is not intuitively obvious. In the textbook, the data are set up as two groups of 9 clients. In SPSS, all 18 scores (9 + 9) are entered in a single column. Then their group membership (medication vs. counseling) is entered in the second column. Thus, enter the data as follows:

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